我们有一些放射性同位素，这些同位素会自发变成其他的原子核。
You've got some radioactive isotopic that can spontaneously decay into some other nucleus.
放射性同位素，是指某种发生放射性衰变的元素中具有相同原子序数但质量不同的核素。
"Radioisotopes" refer to a certain type of elements producing radiation decay that have the same atomic number but different mass of nuclides.
在一个同位素的原子中中子数减去质子数，同位数是放射性的指示。
The number of neutrons minus the number of protons in the atom of an isotope. isotopic number is an indication of radioactivity.
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